Instalar Drush globalmente

Drush da la opción de descargarte un archivo *.phar para instalar globalmente la consola.

# Download latest stable release using the code below or browse to github.com/drush-ops/drush/releases.
php -r "readfile('http://files.drush.org/drush.phar');" > drush
# Make `drush` executable as a command from anywhere. Destination can be anywhere on $PATH.
chmod +x drush
sudo mv drush /usr/local/bin
# Test your install.
php drush core-status
# Optional. Enrich the bash startup file with completion and aliases.
drush init